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Variable Interest Entities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Variable Interest Entities
Carrying amount of loans and investments before reserves related to VIEs	$ 4,279,611
Loan loss reserves related to VIEs	71,069	$ 71,069	$ 62,783	$ 83,712
Assets:
Restricted cash	210,875	180,606	$ 139,398	$ 29,315
Loans and investments, net	4,189,960	3,200,145
Other assets	125,788	86,086
Total assets	6,239,160	4,612,175
Liabilities:
Collateralized loan obligations	2,130,121	1,593,548
Debt fund	68,629	68,183
Other liabilities	134,299	118,780
Total liabilities	4,883,133	3,546,609
Consolidated variable interest entities
Assets:
Total assets	2,784,756	2,198,096
Liabilities:
Total liabilities	2,209,599	1,665,139
CLOs and Debt Fund
Assets:
Restricted cash	208,467	179,855
Loans and investments, net	2,557,909	2,001,617
Other assets	18,380	16,624
Total assets	2,784,756	2,198,096
Liabilities:
Collateralized loan obligations	2,130,121	1,593,548
Debt fund	68,629	68,183
Due to related party	6,734
Other liabilities	4,115	3,408
Total liabilities	$ 2,209,599	$ 1,665,139
Unconsolidated VIEs
Variable Interest Entities
Number of VIEs where the reporting entity is not VIE's primary beneficiary and VIEs have variable interest | item	30
Carrying Amount	$ 540,564
Carrying amount of loans and investments before reserves related to VIEs	129,000
Loan loss reserves related to VIEs	69,400
Exposure to real estate debt	4,480,000
Unconsolidated VIEs | Loans
Variable Interest Entities
Carrying Amount	436,169
Unconsolidated VIEs | B Piece bonds
Variable Interest Entities
Carrying Amount	88,699
Unconsolidated VIEs | Equity investments
Variable Interest Entities
Carrying Amount	12,961
Unconsolidated VIEs | Agency interest only strips
Variable Interest Entities
Carrying Amount	$ 2,735

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of commercial real estate debt fund (with maturities initially due after one year or beyond the operating cycle, if longer). The Debt fund is secured by a portfolio of loan obligations, which includes first mortgage bridge loans, senior participations interests in first mortgage bridge loans, subordinate participation interest in first mortgage bridge loans and participation interests in mezzanine loans. The Debt Fund allows, for a period of three years, principal proceeds from portfolio assets to be reinvested in qualifying replacement assets, subject to certain conditions.

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